1211111330 has 32 divisors (see below), whose sum is σ = 2561122368. Its totient is φ = 406526400.

The previous prime is 1211111303. The next prime is 1211111333. The reversal of 1211111330 is 331111121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1211111333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422036 + ... + 424895.

It is an arithmetic number, because the mean of its divisors is an integer number (80035074).

Almost surely, 2^1211111330 is an apocalyptic number.

1211111330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1211111330 is an abundant number, since it is smaller than the sum of its proper divisors (1350011038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211111330 is a wasteful number, since it uses less digits than its factorization.

1211111330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846962.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 1211111330 is about 34801.0248412313. The cubic root of 1211111330 is about 1065.9283726793.

Adding to 1211111330 its reverse (331111121), we get a palindrome (1542222451).

The spelling of 1211111330 in words is "one billion, two hundred eleven million, one hundred eleven thousand, three hundred thirty".